public static SKBitmap ResizeBitmap(
[InputPin(PropertyMode = PropertyMode.Never)] SKBitmap bitmap,
[InputPin(PropertyMode = PropertyMode.Default)] int width = 256,
[InputPin(PropertyMode = PropertyMode.Default)] int height = 256,
[InputPin(PropertyMode = PropertyMode.Default)] SKBitmapResizeMethod method = SKBitmapResizeMethod.Lanczos3
)
{
if (bitmap.ColorType != SKImageInfo.PlatformColorType)
{
using (var platformBitmap = new SKBitmap())
{
if (!bitmap.CopyTo(platformBitmap, SKImageInfo.PlatformColorType))
{
throw new Exception($"Could not convert input image ({bitmap.ColorType}) to SKIA platform color type ({SKImageInfo.PlatformColorType}).");
}
var destinationInfo = platformBitmap.Info;
destinationInfo.Width = width;
destinationInfo.Height = height;
return(platformBitmap.Resize(destinationInfo, method));
}
}
else
{
SKBitmap result = new SKBitmap(width, height, bitmap.ColorType, bitmap.AlphaType);
bitmap.Resize(result, method);
return(result);
}
}
private static void ConvertBitmapIfNecessary(SKBitmap bitmap)
{
if (IsColorTypeSupported(bitmap.ColorType))
{
return;
}
bitmap.CopyTo(bitmap, GetPlatformColorType());
}
public static Bitmap ToBitmap(this SKBitmap skiaBitmap)
{
// TODO: replace all this with a SKBitmap.PeekPixels
// and call the overload
var info = skiaBitmap.Info;
// try keep the pixel format
var config = Bitmap.Config.Argb8888;
switch (info.ColorType)
{
case SKColorType.Alpha8:
config = Bitmap.Config.Alpha8;
break;
case SKColorType.Rgb565:
config = Bitmap.Config.Rgb565;
break;
case SKColorType.Argb4444:
config = Bitmap.Config.Argb4444;
break;
}
var bmp = Bitmap.CreateBitmap(info.Width, info.Height, config);
var ptr = bmp.LockPixels();
var success = true;
if (config == Bitmap.Config.Argb8888 && info.ColorType != SKColorType.Rgba8888)
{
// wrap the pixels so we can copy in one action
var tempInfo = new SKImageInfo(info.Width, info.Height, SKColorType.Rgba8888, SKAlphaType.Premul);
// TODO: replace this with a SKPixmap.ReadPixels
var tempBmp = new SKBitmap();
tempBmp.InstallPixels(tempInfo, ptr);
success = skiaBitmap.CopyTo(tempBmp, SKColorType.Rgba8888);
tempBmp.Reset();
tempBmp.Dispose();
}
else
{
// must multiply HEIGHT * rowBytes to get total number of bytes
success = skiaBitmap.CopyPixelsTo(ptr, bmp.Height * bmp.RowBytes);
}
bmp.UnlockPixels();
if (!success)
{
bmp.Recycle();
bmp.Dispose();
bmp = null;
}
return(bmp);
}
/// <summary>Initializes a new instance of the <see cref="Bitmap32"/> class.</summary>
/// <param name="bitmap">The bitmap.</param>
public SkiaBitmap32(SKBitmap bitmap)
: base()
{
if (bitmap.ColorType != SKImageInfo.PlatformColorType)
{
//change colortype
SKBitmap bmp = new SKBitmap(bitmap.Width, bitmap.Height, SKImageInfo.PlatformColorType, SKAlphaType.Unpremul);
bitmap.CopyTo(bmp, SKImageInfo.PlatformColorType);
bitmap = bmp;
}
this.bitmap = bitmap ?? throw new ArgumentNullException("bitmap");
}
public void Export(string path, int width, int height)
{
if (!File.Exists(path))
{
Log.Write($"[{this.Path} ({this.bitmap.Width}x{this.bitmap.Height})({this.Density}x)] -> Generating [{path} ({width}x{height})]");
// SKBitmap.Resize() doesn't support SKColorType.Index8
// https://github.com/mono/SkiaSharp/issues/331
if (bitmap.ColorType != SKImageInfo.PlatformColorType)
{
bitmap.CopyTo(bitmap, SKImageInfo.PlatformColorType);
}
var info = new SKImageInfo(width, height);
using (var resized = bitmap.Resize(info, SKBitmapResizeMethod.Lanczos3))
{
if (resized == null)
{
throw new InvalidOperationException($"Failed to resize : {Path}.");
}
using (var image = SKImage.FromBitmap(resized))
using (var data = image.Encode())
{
path.CreateParentDirectory();
if (File.Exists(path))
{
File.Delete(path);
}
using (var fileStream = File.Create(path))
using (var outputStream = data.AsStream())
{
outputStream.CopyTo(fileStream);
}
}
}
}
else
{
Log.Write($"[{this.Path} ({this.bitmap.Width}x{this.bitmap.Height})({this.Density}x)] -> Didn't generate [{path} ({width}x{height})] because it already exists.");
}
}
public void Export(string path, int width, int height)
{
if (File.Exists(path) && File.GetLastWriteTime(path) >= File.GetLastWriteTime(Path))
{
Log.Write($"[{Path} ({_bitmap.Width}x{_bitmap.Height})({Density}x)] -> Didn't generate [{path} ({width}x{height})] because it already exists and hasn't been updated.");
}
else
{
Log.Write($"[{Path} ({_bitmap.Width}x{_bitmap.Height})({Density}x)] -> Generating [{path} ({width}x{height})].");
if (_bitmap.ColorType != SKImageInfo.PlatformColorType)
{
_bitmap.CopyTo(_bitmap, SKImageInfo.PlatformColorType);
}
var info = new SKImageInfo(width, height);
using (var resized = _bitmap.Resize(info, SKFilterQuality.High))
{
if (resized == null)
{
throw new InvalidOperationException($"Failed to resize: {Path}.");
}
using (var image = SKImage.FromBitmap(resized))
using (var data = image.Encode())
{
path.CreateParentDirectory();
if (File.Exists(path))
{
File.Delete(path);
}
using (var fileStream = File.Create(path))
using (var outputStream = data.AsStream())
outputStream.CopyTo(fileStream);
}
}
}
Log.Write($"AssetManGeneratedFile({path})");
}
